CN104032064A - Steel-making method - Google Patents
Steel-making method Download PDFInfo
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- CN104032064A CN104032064A CN201410290547.XA CN201410290547A CN104032064A CN 104032064 A CN104032064 A CN 104032064A CN 201410290547 A CN201410290547 A CN 201410290547A CN 104032064 A CN104032064 A CN 104032064A
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Abstract
The invention discloses a steel-making method comprising the steps: within 60 seconds from the beginning of converting, controlling the oxygen lance position of top-blowing oxygen to be 1.8-2.3 meters, and controlling the oxygen supply flow to be 18000-23000Nm<3>/h; from the sixtieth second to the ninetieth second of converting, controlling the oxygen lance position of top-blowing oxygen to be 1.5-1.8 meters, and controlling the oxygen supply flow to be 29000-32000Nm>3>/h; after converting for 90 seconds, controlling the oxygen lance position of top-blowing oxygen to be 1.5-2.6 meters, and controlling the oxygen supply flow to be 40000-45000Nm>3>/h; within 11 minutes from the beginning of converting, controlling the flow of bottom-blowing inert gas to be 30-50Nm<3>/h; from the eleventh second of converting to the end of tapping, controlling the flow of the bottom-blowing inert gas to be 50-80Nm<3>/h. According to the method disclosed by the invention, the top-blowing oxygen flow, the oxygen lance position and the bottom-blowing inert gas flow of each period in a converter smelting process are reasonably controlled so as to ensure that leakage and explosion of a dry-process dust removal system can be prevented in a semi-steel making process adopting top-bottom combined blowing, thus reducing the damages to dry-process dust removal system equipment.
Description
Technical field
The present invention relates to a kind of semisteel smelting method, specifically, relate to a kind of method that prevents dedusting venting of dust explosion in top and bottom complex blowing semisteel smelting process.
Background technology
Ld Top-bottom Combination Blowing Process method is to grow up late 1970s, has the advantage of top-blown method and subaeration concurrently, and equipment is simple, can transform original top blown converter as top bottom blowing converter relatively easily.Therefore, converter top bottom blowing method is widely used in countries in the world.In addition,, along with scientific and technological development, in semisteel smelting, also gradually adopt top bottom blowing method to smelt.
Conventionally, the dust-removal system in semisteel smelting process is mainly divided into dry-dedusting system and wet method dedusting system.For wet method dedusting system, automatic control level and coal-gas recovering amount are all lower, and the dust content of gas after purification still reaches 100mg/m
3, recovery system energy consumption is larger.By contrast, the dust content of gas after dry-dedusting system purification is only about 10mg/m
3.Therefore, the dust removing effects of dry-dedusting system is more remarkable compared with wet method dedusting system.
Yet, there is the problem of venting of dust explosion in steelmaking process in the semisteel converter steelmaking of employing dry method dust, mainly to occur in Primary period, its reason is that the CO that reaction is obtained of reaction between carbon and oxygen increases gradually, and now, has again a large amount of unburned oxygen to exist, when CO and oxygen together enter in electrostatic precipitator, and CO concentration reaches 9%, oxygen concentration is while reaching 6%, very easily produces detonation in electrostatic precipitator, causes dry-dedusting system venting of dust explosion.
In addition, in semisteel smelting process, even reduce oxygen flow at Primary period, also cannot avoid well the leakage problem of dry-dedusting system.This may be when lower rifle blowing, owing to adding steel scrap, auxiliary material etc. to cause sparking freely not make oxygen concentration, and after sparking, carbon, the more CO of the violent generation of oxygen reaction, the concentration that makes to enter into the most oxygen of CO in the electrostatic precipitator of dry-dedusting system and unburn is higher, very easily reach the venting of dust explosion limit, thereby cause the generation of venting of dust explosion, then dry-dedusting system equipment is caused to damage, and leakage process has reduced the yield of coal gas in converting process, indirectly increased the production cost of converter steelmaking.
Summary of the invention
One object of the present invention is to provide a kind of can prevent the method for making steel of dry-dedusting system venting of dust explosion in the process that adopts top and bottom complex blowing semi-steel making.
According to the method for making steel that prevents top and bottom complex blowing semi-steel making dedusting venting of dust explosion of the present invention, described method for making steel comprises the steps: that blowing started in 60 seconds, and the oxygen lance position of controlling top blast oxygen is 1.8m～2.3m, and oxygen flow is 18000Nm
3/ h～23000Nm
3/ h; Blow 60 seconds to 90 seconds in, the oxygen lance position of controlling top blast oxygen is 1.5m～1.8m, and oxygen flow is 29000Nm
3/ h～32000Nm
3/ h; Blow after 90 seconds, the oxygen lance position of controlling top blast oxygen is 1.5m～2.6m, and oxygen flow is 40000Nm
3/ h～45000Nm
3/ h; In blowing starts to 11 minutes, the flow of controlling bottom blowing rare gas element is 30Nm
3/ h～50Nm
3/ h; Complete to tapping blowing 11 minutes, the flow of controlling bottom blowing rare gas element is 50Nm
3/ h～80Nm
3/ h.
According to embodiments of the invention, after blowing 90 seconds, carry out in accordance with the following steps top blast oxygen: blow 90 seconds to 150 seconds in, the oxygen lance position of controlling top blast oxygen is 1.6m; Blow 150 seconds to 310 seconds in, the oxygen lance position of controlling top blast oxygen is 2.6m; Blow 310 seconds to 11 minutes in, according to slag form, adjust the oxygen lance position of top blast oxygen, to guarantee dephosphorization; Blow after 11 minutes, the oxygen lance position of controlling top blast oxygen is 1.5m.
According to embodiments of the invention, blowing 11 minutes to tap complete in, carry out in accordance with the following steps bottom blowing rare gas element: blow 11 minutes to starting in the process of tapping, the flow of control bottom blowing rare gas element is 80Nm
3/ h; Start tapping to tapping in complete process, the flow of controlling bottom blowing rare gas element is 50Nm
3/ h.
According to embodiments of the invention, before described method is also included in and bessemerizes beginning, bottom blowing flow is 30Nm
3the rare gas element of/h.
According to embodiments of the invention, described method be also included in tapping complete after, bottom blowing flow is 50Nm
3the rare gas element of/h is to carry out slag splashing.
According to the method for making steel that prevents top and bottom complex blowing semi-steel making dedusting venting of dust explosion of the present invention, by reasonably controlling top blowing oxygen airshed, oxygen lance position and the bottom blowing inert gas flow in each period in converter steelmaking process, make (for example can prevent dry-dedusting system generation venting of dust explosion in the process that adopts top and bottom complex blowing semi-steel making, venting of dust explosion rate can be reduced to 3 ‰), thus the damage to dry-dedusting system equipment reduced.
Embodiment
Below in conjunction with embodiment, method for making steel of the present invention is described in detail.
Method for making steel according to the present invention comprises: blowing started in 60 seconds, and the oxygen lance position of controlling top blast oxygen is 1.8m～2.3m, and oxygen flow is 18000Nm
3/ h～23000Nm
3/ h; Blow 60 seconds to 90 seconds in, the oxygen lance position of controlling top blast oxygen is 1.5m～1.8m, and oxygen flow is 29000Nm
3/ h～32000Nm
3/ h; Blow after 90 seconds, the oxygen lance position of controlling top blast oxygen is 1.5m～2.6m, and oxygen flow is 40000Nm
3/ h～45000Nm
3/ h; In blowing starts to 11 minutes, the flow of controlling bottom blowing rare gas element is 30Nm
3/ h～50Nm
3/ h; Complete to tapping blowing 11 minutes, the flow of controlling bottom blowing rare gas element is 50Nm
3/ h～80Nm
3/ h.
First, in blowing starts to 60 seconds, the oxygen lance position of controlling top blast oxygen is 1.8m～2.3m, and oxygen flow is 18000Nm
3/ h～23000Nm
3/ h, and the flow of bottom blowing rare gas element is 30Nm
3/ h～50Nm
3/ h.Because blowing started to the time period of 60 seconds, the reaction between carbon and oxygen in converter is relatively slow, if the oxygen amount of being blown into is too much, the oxygen that major part cannot consume can be drawn into flue by blower fan, cause the interior oxygen level of flue too high, reach the venting of dust explosion limit, thereby cause the generation of venting of dust explosion.In addition, if the flow of bottom blowing rare gas element is excessive, agitation molten pool speed is fast, will promote the generation of CO, equally easily reaches the venting of dust explosion limit, causes the generation of venting of dust explosion.Therefore,, within this stage, adopt low oxygen flow, higher oxygen lance position and low inert gas flow can effectively reduce the condition that the interior unreacted oxygen level of stove makes it to reach venting of dust explosion.Wherein, in blowing starts to 60 seconds, the oxygen lance position that can control top blast oxygen is 2.2m, and oxygen flow is 22000Nm
3/ h, and the flow of bottom blowing rare gas element is 50Nm
3/ h.
According to embodiments of the invention, for the oxygen that further makes to be passed in stove fully reacts, the oxygen of avoiding major part to consume is drawn into flue by blower fan, cause the interior oxygen level of flue too high, reach the venting of dust explosion limit, thereby cause the generation of venting of dust explosion, preferably, can be before bessemerizing beginning, bottom blowing flow is 30Nm
3the rare gas element of/h.
Next, in blowing, start in 60 seconds to 90 seconds, the oxygen lance position of controlling top blast oxygen is 1.5m～1.8m, and oxygen flow is 29000Nm
3/ h～32000Nm
3/ h, and the flow of bottom blowing rare gas element is 30Nm
3/ h～50Nm
3/ h.This be because, oxygen is opened and is blown in 60 seconds to 90 seconds, reaction between carbon and oxygen is comparatively violent, oxygen depletion amount increases, and now, oxygen lance position is dropped to 1.5m～1.8m, oxygen flow is controlled at 29000Nm
3/ h～32000Nm
3/ h, not only can be for sufficient oxygen level is provided in stove, but also can avoid the follow-up caused oxygen content of unexpected increase because of oxygen flow sharply to rise, and then causes the problem of venting of dust explosion.In addition, by bottom blowing rare gas element, carry out the molten steel in rabbling roaster, promote that molten steel composition is even, the oxygen that makes to enter in stove fully reacts, thereby avoids causing because of unreacted oxygen the generation of venting of dust explosion.Wherein, in blowing, start in 60 seconds to 90 seconds, the oxygen lance position that can control top blast oxygen is 1.6m, and oxygen flow is 30000Nm
3/ h, and the flow of bottom blowing rare gas element is 50Nm
3/ h.
Then, after blowing 90 seconds, the oxygen lance position of controlling top blast oxygen is 1.5m～2.6m, and oxygen flow is 40000Nm
3/ h～45000Nm
3/ h, and in blowing 90 seconds to 11 minutes, the flow of bottom blowing rare gas element is 30Nm
3/ h～50Nm
3/ h, complete to tapping blowing 11 minutes, the flow of controlling bottom blowing rare gas element is 50Nm
3/ h～80Nm
3/ h.Blow after 90 seconds, the reaction between carbon and oxygen of semi-steel making is quite violent, now oxygen depletion amount is huge, by controlling oxygen lance position and oxygen flow, can in molten bath, provide sufficient oxygen, and by increasing bottom blowing inert gas flow, strengthen the stirring to molten bath, thereby guarantee converter smelting effect.In addition, by increasing bottom blowing inert gas flow, make the composition of molten steel even, thus reduced slag oxidisability, reduced the consumption of iron and steel stock, improved the purity of molten steel.
According to embodiments of the invention, after blowing 90 seconds, can carry out in accordance with the following steps top blast oxygen: blow 90 seconds to 150 seconds in, the oxygen lance position of controlling top blast oxygen is 1.6m; Blow 150 seconds to 310 seconds in, the oxygen lance position of controlling top blast oxygen is 2.6m; Blow 310 seconds to 11 minutes in, according to slag form, adjust the oxygen lance position of top blast oxygen, to guarantee dephosphorization; Blow after 11 minutes, the oxygen lance position of controlling top blast oxygen is 1.5m.
According to embodiments of the invention, for cost-saving, preferably, can blowing 11 minutes to tap complete in, carry out in accordance with the following steps bottom blowing rare gas element: blow 11 minutes to starting in the process of tapping, the flow of control bottom blowing rare gas element can be 80Nm
3/ h; Start tapping to tapping in complete process, the flow of controlling bottom blowing rare gas element can be 50Nm
3/ h.
In addition, according to embodiments of the invention, be also included in tapping complete after, bottom blowing flow is 50Nm
3the rare gas element of/h is to carry out slag splashing to converter.
In non-limiting example of the present invention, rare gas element can be nitrogen or argon gas.For example, when producing common iron, for cost-saving, can start blowing to 8 minutes in bottom blowing nitrogen, blow and change argon bottom-blowing into after 8 minutes, can remove the nitrogen content in molten steel like this.When producing high-level steel, can whole converting process all adopt argon bottom-blowing.
According to method for making steel of the present invention, by reasonably controlling top blowing oxygen airshed, oxygen lance position and the bottom blowing inert gas flow in each period in converter steelmaking process, make (for example can prevent dry-dedusting system generation venting of dust explosion in the process that adopts top and bottom complex blowing semi-steel making, venting of dust explosion rate can be reduced to 3 ‰), thus the damage to dry-dedusting system equipment reduced.
More than describe the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant and combination to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (5)
1. a method for making steel, is characterized in that described method for making steel comprises the steps:
Blowing started in 60 seconds, and the oxygen lance position of controlling top blast oxygen is 1.8m～2.3m, and oxygen flow is 18000Nm
3/ h～23000Nm
3/ h; Blow 60 seconds to 90 seconds in, the oxygen lance position of controlling top blast oxygen is 1.5m～1.8m, and oxygen flow is 29000Nm
3/ h～32000Nm
3/ h; Blow after 90 seconds, the oxygen lance position of controlling top blast oxygen is 1.5m～2.6m, and oxygen flow is 40000Nm
3/ h～45000Nm
3/ h; In blowing starts to 11 minutes, the flow of controlling bottom blowing rare gas element is 30Nm
3/ h～50Nm
3/ h; Complete to tapping blowing 11 minutes, the flow of controlling bottom blowing rare gas element is 50Nm
3/ h～80Nm
3/ h.
2. method for making steel according to claim 1, wherein, after blowing 90 seconds, carries out top blast oxygen: blow 90 seconds to 150 seconds in, the oxygen lance position of controlling top blast oxygen is 1.6m in accordance with the following steps; Blow 150 seconds to 310 seconds in, the oxygen lance position of controlling top blast oxygen is 2.6m; Blow 310 seconds to 11 minutes in, according to slag form, adjust the oxygen lance position of top blast oxygen, to guarantee dephosphorization; Blow after 11 minutes, the oxygen lance position of controlling top blast oxygen is 1.5m.
3. method for making steel according to claim 1, wherein, blowing 11 minutes to tap complete in, carry out in accordance with the following steps bottom blowing rare gas element: blow 11 minutes to starting in the process of tapping, the flow of control bottom blowing rare gas element is 80Nm
3/ h; Start tapping to tapping in complete process, the flow of controlling bottom blowing rare gas element is 50Nm
3/ h.
4. method for making steel according to claim 1, wherein, before described method is also included in and bessemerizes beginning, bottom blowing flow is 30Nm
3the rare gas element of/h.
5. method for making steel according to claim 1, wherein, described method be also included in tapping complete after, bottom blowing flow is 50Nm
3the rare gas element of/h is to carry out slag splashing.
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|---|---|---|---|
| CN201410290547.XA CN104032064B (en) | 2014-06-25 | 2014-06-25 | A kind of method for making steel |
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|---|---|---|---|
| CN201410290547.XA CN104032064B (en) | 2014-06-25 | 2014-06-25 | A kind of method for making steel |
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| CN104032064A true CN104032064A (en) | 2014-09-10 |
| CN104032064B CN104032064B (en) | 2016-02-03 |
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| CN105950816A (en) * | 2016-05-25 | 2016-09-21 | 河北钢铁股份有限公司承德分公司 | Combined blowing dephosphorization method of converter |
| CN106884069A (en) * | 2015-12-16 | 2017-06-23 | 鞍钢股份有限公司 | Converter smelting slagging method |
| CN115404301A (en) * | 2022-09-09 | 2022-11-29 | 山东莱钢永锋钢铁有限公司 | Method for preventing converter dry dedusting system from explosion venting |
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| CN103725821A (en) * | 2013-11-27 | 2014-04-16 | 攀钢集团西昌钢钒有限公司 | Method for prolonging life of vanadium-and-titanium-containing semi-steel making converter |
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2014
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Cited By (5)
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|---|---|---|---|---|
| CN104313235A (en) * | 2014-10-30 | 2015-01-28 | 攀钢集团西昌钢钒有限公司 | Method for preventing blowing explosion venting of dry dust-removing system of semi-steel steelmaking converter |
| CN106884069A (en) * | 2015-12-16 | 2017-06-23 | 鞍钢股份有限公司 | Converter smelting slagging method |
| CN105950816A (en) * | 2016-05-25 | 2016-09-21 | 河北钢铁股份有限公司承德分公司 | Combined blowing dephosphorization method of converter |
| CN115404301A (en) * | 2022-09-09 | 2022-11-29 | 山东莱钢永锋钢铁有限公司 | Method for preventing converter dry dedusting system from explosion venting |
| CN115404301B (en) * | 2022-09-09 | 2024-02-27 | 山东莱钢永锋钢铁有限公司 | Method for preventing explosion venting of converter dry dedusting system |
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